﻿<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Example05.aspx.cs" Inherits="Chapter29.Example05" %>

<!DOCTYPE html>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>代码清单 29-5 从一个 HTMLElement 上获取 CSSStyleDeclaration 对象</title>
    <meta name="author" content="Adam Freeman" />
    <meta name="description" content="A simple example" />
    <link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />
</head>
<body>
    <p id="block1">
        There are lots of different kinds of fruit - there are you over 500 varieties 
        of banana alone. By the time we add the countless 
        types of apples, oranges, and other well-known fruit, we are 
        faced with thousands of choices.
    </p>
    <div>
        <button id="pressme">Press Me</button>
    </div>
    <div id="placeholder"></div>
    <script>
        var placeholder = document.getElementById("placeholder");
        var targetElem = document.getElementById("block1");
        displayStyle();

        document.getElementById("pressme").onclick = function () {
            targetElem.style.cssText = "border:thin solid black;";
            displayStyle();
        }

        function displayStyle() {
            if (placeholder.hasChildNodes()) {
                placeholder.removeChild(placeholder.firstChild);
            }
            var newElem = document.createElement("table");
            addRow(newElem, "Element CSS", targetElem.style.cssText);
            placeholder.appendChild(newElem);
        }

        function addRow(elem, header, value) {
            elem.innerHTML += "<tr><td>" + header + ":</td><td>" + value + "</td></tr>";
        }
    </script>
</body>
</html>
